BBT

Someone who sends you BBT will "be back tomorrow." Your friends and family members might use BBT in text, chat, or email messages, to tell you when they plan to return to home, work, school, or somewhere else.

You may also encounter BBT in co-workers' Away messages, when they've left work early but will be back tomorrow. For example, your colleague Bob may set his Away message to "Had to pick up kids; BBT." This means Bob's out for the rest of the day, but will be working as usual tomorrow.